Is there any app developer available?

If we go through history, we will discover that entertainment is one thing that is sold in every age and time. In the recent past, it was VCR and TV, in current times it is Netflix and Amazon Prime that are making a huge business through entertainment. I also have an amazing idea for my entertainment app and looking for a developer to create it for me. I saw a recommendation for a mobile app development firm in USA on the internet and I’m pretty convinced to hire them. I need guidance on this matter with the further process regarding this app.